Transient vision loss at depth due to presumed barotraumatic optic neuropathy.

Pressure-related vision loss has been reported during ascent to altitude. We report the case of an otherwise healthy diver who suffered painless, sudden-onset binocular vision loss at depth, followed by complete recovery immediately upon surfacing. We examine the dive and briefly discuss the differential diagnosis of transient vision loss in the setting of ambient pressure changes. We conclude that the diver likely suffered from sphenoid sinus barotrauma, possibly in association with dehiscence of the bony canals of the optic nerves as they travel in close proximity to the walls of the sphenoid sinus.